Select the items you want to clear (e.g., Clear browsing history, Clear download history, Empty
the cache, Delete cookies and other site and plug-in data).
From the Obliterate the following items from: drop-down menu, you can choose the period of
time for which you want to clear cached information. To clear your entire cache, select the beginning
of time.

Click Clear browsing data.

Mac OS X

Safari

From the Safari menu, select Reset Safari... .

From the menu, select the items you want to reset, and then click Reset. As of Safari 5.1, Remove
all website data covers both cookies and cache.

Firefox 3.5 and later

From the Tools menu, select Clear Recent History.

From the Time range to clear: drop-down menu, select the desired range; to clear your entire
cache, select Everything.

Click the down arrow next to "Details" to choose which elements to clear. Click Clear Now.